Dental-engine head



W. J. LAUREN AND J. OHALLORAN DENTAL ENGINE HEAD.

APPLICATION FILED 0cT.27. 1919.

1 ,333,809. Patented Mar. 16, 1920.

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17v VEN TORG:

WILL/AM (7. LAL/ER. JbsE-PH OHALLORAN.

THE/F? AT TORNE Y6.

ETED B aZiENT-I WILLIAM J. LAURER AND JOSEPH onannonan, or ARGYLE, n'nmnse'ra.

DENTAL-ENGINE HEAD.

' county of Marshall and State of Minnesota,

have invented certain new and useful Improvements in Dental-Engine Heads, of which the following is a specification.

Our invention relates to dental engine heads and an object is to provide a device of this character in which dental tools may be operatively mounted for adjustment into different angular positions according to the character of the work being performed in r the mouth of patients.

The full objects and advantages of our invention will appear in connection with the detailed description thereof and the novel features embodied in our inventive idea will be particularly pointed out in the claims. i j

Referring to the accompanying drawings, which illustrate the application of our invention in one form v Figure 1 is a view substantially in longitudinal central section on theline '11 of Fig. 2. Fig.2 is a View substantially in longitudinal central section on the line 2-2 of Fig. 1. Fig. 3 is a view of the device in side elevation. Fig. 1 is a detail view of a tool-retaining device.

Referring to the particular construction shown in the drawings, the customary handengageable member associated with the enr gine, is provided with a rotatable driving shaft 12 which passes througl'i this member. To the extended end portion 14: of the handengageable member is secured a head member which consists of a relatively fixed casing member 16 having a screw-threaded lug 18 adapted to be screwed into a hollow projection 20 on the member lt. A casing member 22 is mounted on the member 16 for rotative movement in the following manner. An annular flange or reduced portion 241 located at the margin of the member 22 is adapted to rotatively fit into an annular groove formed in the margin of the member 16. The member 22 adjacent the flange 2% and outside thereof is provided with an annular shoulder 26 which is engaged by the reduced margin of a ring 28 adapted to be screwed upon the member 16 outside of the annular groove therein. The member 22 is thus rotatably held to the member'16 and in order to retain the member 22 in de- Specification of Letters Patent. .PatQHljed 'Mar.

Application filed October 27, 1919. Serial No. 333,832.

is, man.

sired adjusted position it is provided in its lower wall with a circularly arranged series of holes 30, any one of which may be brought into register with a hole in an angle piece 32 secured to the end wall of the member 16. A pin or detent 3a is adapted to extend through the hole inthe member and into any one of the holes 30 which is p in register according to the position into which the member 22 is turned, so that the latter may be retained in any desired adjusted position. The end of the shaft 12 extends into the casing formed by the members l6 and 22 and upon saidend is secured I a bevel gear 36 which meshes with a bevel gear 38 secured to one end of a shaft 510 mounted in a bearing 42 which is secured to the inner surface of the member 16. Upon the other end of the shaft 10 is secured a bevel gear at which meshes with teeth 16 extending circumferentially around one side of a gear 48 mounted upon a shaft '50 extending inwardly from the member 16. The other side of the gear 18 is provided with teeth 52 which mesh with a bevel gear 5 1 secured to a tubular shaft 56 mounted in bearings 58 and 60 carried by the rotatable member A tool 62 has a shank portion 6 1 which is adapted to be inserted in the tubular shaft 56 and engaged by a key 66 carried by this shaft. The end of the shank 6a is provided with a circumferential groove adapted to be engaged by a locking lever 68 pivoted tov the end wall of the rotatable member 22. The member 16 is provided with an opening '70, and when themeinber is rotated sufficiently the lever 68 is brought outside the casing through this opening in order that any particular tool may be removed and another one SUbSt1-.

tuted.

The operation and advantages of our invention will be readily understood from the foregoing description. Upon withdrawing the detent 3% and rotating the member 22 the tool may be brought into different angular positions according tothe character of work being performed in a mouth of a patient it is therefore unnecessary to provide a number of differently shaped heads for this purpose. By referring to Fig. 2 it will be seen that the range of adjustment provided for is substantially one hundred and eighty degrees. By referring to Fig. 1 it is obvious that when the member 22 is turned, the gear 54 will. remain in mesh with the-teeth 52 of the gear l8 and will rotate into another position relatively to the circumference of the gear 48. Ne claim: 1; A dental head comprising a relatively fixed cup-shaped member, an adjustable cupshaped member having a circular margin 7 rotatably attached to said fixed member for Eli adjusting purposes, a driving shaft having its outer end supported adjacent said members, a dental tool-holding member rotatably mounted in said adjustable member, driving connections between said driving shaft and said tool-holding member, and means for uring said adjustable member in adjusted position.

2, A dental head comprising a relatively.

'tively fixed cup-shaped member, an adjustable cup-shaped member having a circular margin rotatably attached to said fixed member for adjusting purposes, a driving shaft having its outer end supported adjacent said members, a gear secured to said shaft end, a tubular shaft rotatably mounted in said adjustable member, a gear secured to said tubular shaft, a system of gearing mounted on said fixed member and interposed between said before-mentioned gears, said tubular shaft being adapted to non-rotatably receive the shank of a dental tool, and means for securing said adjustable member in adjusted position, 7

4. A dental engine head comprising a relatively fixed casingmember, a cooperating casing member'attached to'said' fixed casing member for rotation thereon, a drivingshaft having its outer end extending into the casing through the end wall of said fixed casing member, a bevel gear secured to said shaft end, a short shaft mounted in said fixed casing member, a bevel gear secured onone end of said short shaftand meshing with said first-mentioned bevel gear, a bevel gear secured to the other end of said short shaft, a gear rotatably supported by said fixed casing member, said last-mentioned gear shaving teeth circumf'erentially arranged upon-both of its sides, the teeth on one of said sides meshing with said last-mentioned bevel gear, a tubular shaft rotatably 'mounted in said rotatable casing member, a bevel gear secured to said tubular shaft and meshing with the teeth on the other side of said double-toothed gear, said tubular shaft being adapted to nonrota-tably receive the shank of a dental tool, and means for securing said rotatable casing member in adjusted position.

' In testimony whereof we hereunto affix our signatures.

WILLIAM J. LAURER.

JOSEPH OHALLORAN. 

